Printed circuit boards used in several different avionics devices are 100% tested for defects. The batch size for each board type is relatively small, and management wishes to establish SPC using short-run version of the c chart. Defect data from the last two weeks of production are shown in Table 10E.3. What chart would you recommend? Set up the chart and examine the process for control.
Answer to relevant QuestionsA machine has four heads. Samples of n= 3 units are selected from each head, and the x and R values for an important quality characteristic are computed. The data are shown in Table10E.4. Set up group control charts for this ...The data shown in Table 11.E1 come from a production process with two observable quality characteristics: x1 and x2. The data are sample means of each quality characteristic, based on samples of size n -= 25. Assume that ...Suppose that there are p = 4 quality characteristics, and in correlation form all four variables have variance unity and that all pairwise correlation coefficients are 0.9. The in-control value of the process mean vector ...Reconsider the situation in Exercise 11.1. Suppose that the sample mean vector and sample covariance matrix provided were the actual population parameters. What control limit would be appropriate for phase II for the control ...Consider the data in Table 12.1. Construct a bounded adjustment chart using = 0.3 and L = 10. Compare the performance of this chart to the one in Table 12.1 and Figure 12.12.
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